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  • Some meta - directing substituents in aromatic substitution are given. Which one is most deactivating?Option: 1 -NO2</d

Some meta - directing substituents in aromatic substitution are given. Which one is most deactivating?

Option: 1

-NO2


Option: 2

-C\equivN


Option: 3

-SO3H


Option: 4

-COOH


Answers (1)

best_answer

Resonance Structures and Mesomeric Effect -

A group which accumulates positive charge during resonance is said to show +M effect. And a group which accumulates negative charge during resonance is said to show -M effect.
We can see that the group showing(+M) effect donates the electron density whereas the group showing (-M) effect withdraws the electron density towards it. For example, Nitrobenzene is an electron-withdrawing group and hence it takes the electron density towards it. Thus it shows (-M) effect.

-

 

 - NO_{2}  group is most deactivating towards EAS.

Therefore, Option(1) is correct.

Posted by

Sayak

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